Yin & Yang - In Chinese philosophy, the concept of yin-yang which is often called "yin and yang", is used to describe how seemingly opposite or contrary forces are interconnected and interdependent in the natural world; and, how they give rise to each other as they interrelate to one another. Many natural dualities (such as light and dark, high and low, hot and cold, fire and water, life and death, and so on) are thought of as physical manifestations of the yin-yang concept. Yin and Yang can be thought of as complementary (instead of opposing) forces interacting to form a dynamic system in which the whole is greater than the parts. Everything has both yin and yang aspects, (for instance shadow cannot exist without light).